Definition of quintuplet noun from the Oxford Advanced Learner's Dictionary

 

quintuplet

 noun
noun
BrE BrE//ˈkwɪntʊplət//
 
; NAmE NAmE//ˈkwɪntʊplət//
 
; BrE BrE//kwɪnˈtjuːplət//
 
; NAmE NAmE//kwɪnˈtjuːplət//
 
; BrE BrE//kwɪnˈtʌplət//
 
; NAmE NAmE//kwɪnˈtʌplət//
 
(also British English, informal quin)(also North American English, informal quint)
 
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one of five children born at the same time to the same mother Word Origin late 19th cent.: from quintuple, on the pattern of words such as triplet.
See the Oxford Advanced American Dictionary entry: quintuplet